feat: coordinate concurrent CBM sessions #929

Job	Run time
changes	4s
security / codeql-gate	40m 54s
security / license-gate	3m 22s
security / security-static	24s
lint / lint	9m 6s
pr-smoke (macos-14)	9m 50s
pr-smoke (windows-latest)	8m 43s
pr-smoke (ubuntu-latest)	6m 17s
test / test-tsan	16m 22s
test / setup-matrix	4s
test / test-windows-guards	7m 44s
test / test-unix (ubuntu-latest, gcc, g++)	32m 25s
test / test-unix (macos-14, cc, c++)	26m 46s
test / test-unix (ubuntu-24.04-arm, gcc, g++)	32m 20s
test / test-unix (macos-15-intel, cc, c++)	30m 0s
test / test-windows (windows-latest, CLANG64, x86_64)	32m 24s
ci-ok	3s
	4h 16m 48s

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